Phantom Colossus
Source
Near Space pg. 127
As a reaction, when a hostile creature within 100 feet would take any action to move 10 or more feet toward you or an ally, you can force it to witness an alternate reality in which a massive horror covered in tongues, teeth, and armored plates is bearing down toward it. The target creature must succeed at a Will saving throw or it instead loses its action immediately as it is shocked into stillness, and it cannot voluntarily take any additional movement until the beginning of its next turn. Once an attacker has been affected by this paradigm shift, it can’t be targeted by it again for 24 hours. This is a fear effect.
Dragonscript
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